Windows Voice Dictation
Windows 10 computers should come with a few dictation tools built in to the operating system.
Most text fields should be able to use this feature, and some applications (like Word or Outlook) have specific tools for those applications.
In most applications or general fields you can start by typing "Windows logo key + H" to begin.
You may be prompted to enable this when you first run it.
In applications like Word or Outlook you may have to location a "Dictate" button or shortcut.
Please review these resources directly from Microsoft or let me know if I can help get this working for you. These links include some helpful dictation tips and shorthand that I found helpful when testing. It does take some getting used to, but it is pretty accurate.